Hi! I did a laboration on detecting different wavelenght from a UV-c light tube and the electrometer detected some activity from the Monochromator in the area of visible light (400nm-700nm). I would like to know if this has something to do with the quality of the light tube? Or does something happen between the light tube and Monochromator that gives some photons less energy, ie collisions in the path to the Monochromator? Or is it a combination of both? Also, how come we see the " glow " (the purple glow ) of a UV light, it should not be visible for our eyes. What I mean is, shouldnt the Uv light bulb look like a regular bulb that is not connected to any power source like this one http://www.rapidonline.com/netalogue/zoomed/Large/M077725W01.jpg" [Broken] Thanks!